Study Info

OverviewWSDOT worked with representatives from local agencies and communities to identify potential transportation improvement projects for I-90 in east King County. The study process included gathering input from local officials and the public; collecting and analyzing traffic and other data; reviewing existing local plans and their affect on transportation; projecting future travel demand; and evaluating improvement options. Please see our study library to vew the final report.

Why did WSDOT conduct a study between Bellevue and North Bend?

WSDOT and the Federal Highway Administration (FHWA) co-manage the interstate system in Washington State. Any changes to the interstate system, including I-90, require FHWA’s approval.

FHWA approved construction of the I-90 Sunset interchange in Issaquah with the requirement that WSDOT fund and conduct a corridor study that addresses the safety and mobility needs of this fast-growing corridor.

To meet this requirement, the 2005 Washington State legislature funded $2 million for a study of I-90 between Eastgate in Bellevue and 465th Ave. S.E. in North Bend so that we can identify short- and long-term projects for this corridor to address safety and mobility needs.

Improves Safety
Adding westbound and eastbound merge lanes will help reduce traffic back-ups that can lead to rear-end collisions.

Relieves Congestion
The addition of westbound and eastbound merge lanes between Bellevue and Issaquah reduces efficiency for vehicles exiting and entering I-90.

Partnerships & Cooperation
This study represents a shared plan between WSDOT and local partners to address safety and mobility issues on I-90. Our project team worked with a corridor working group which included representatives from cities along I-90, King County, Sound Transit, Puget Sound Regional Council, Federal Highway Administration, and WSDOT.